I am running a regression equation and i want to enter in 12 IV then stepwise 
enter 8 variables and not have an origin.  

DV is "shfl". I
 want to enter in the following 12 independent dummy variables 
ajan
bfeb
cmar
dapr
emay 
fjun

And then I want to enter in a stepwise fashion 
slag6
slag6
slag6
slag6
slag6
slag6
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